Despite its low graphical style and relatively simplistic gameplay, Minecraft can be an intensive application. There’s a lot going on in the background, especially if you start playing around with redstone-heavy builds.
If you throw mods into the mix, the standard amount of RAM Minecraft needs to run suddenly becomes nowhere near enough. Without enough RAM, you’ll start to encounter stuttering, crashes, and other issues that make the game almost unplayable.
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The good news is that it’s relatively easy to allocate more RAM to Minecraft. The other good news is that there is more than one way to do it.
Make Sure You Have RAM To Spare
Jul 21, 2017 I just did a check on CPU usage of Windows 7 SP1 vs. Windows 10 AU on this machine (dual boot). It seems that Win7 is idling around 5% CPU usage and Win10AU idles around 25%. This is 2 days after updating to AU. Win 7 uses Bit Defender (paid). Once the download had completed and the disk image was being verified, Safari hung for over a minute and there were periods where Safari used a very high%CPU: In Mac OS X 10.5, I was accustomed to seeing Safari freeze, but it never used up more than 200% CPU (2 cores x 100%).
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The first step is to find how exactly how much RAM your PC has. This is easy.
Minecraft calls for a minimum of 2 GB of RAM, although the recommended specs call for 4 GB. If you have more than that, you’re golden. Now you can allocate all the RAM Minecraft needs to quench its thirst.
Method One: Allocate RAM From The Default Launcher
Sep 17, 2006 Hi I have a G4 1.42Ghz dual processor desktop powermac running OSX 10.4.7. The only really CPU hungry thing I use it for is to make music using Pro Tools LE 7. Recently I have recieved a few messages telling me that I am running out of CPU power & I should assign more CPU. The more memory it has, the better. For this reason, you can improve the gaming experience by allocating more RAM to a Minecraft server. How to Allocate More RAM to a Minecraft Server without Launcher. If you think that Minecraft uses a too small amount of RAM on a server, you can add more.
The original, default Minecraft launcher has changed over the years, but you can still allocate more RAM to what Minecraft uses.
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It’s possible to let it use all of the RAM you have available, but whether it actually takes advantage of full utilization depends on if you have anything else running and open in the background.
Method Two: Allocate RAM From The ATLauncher
If you have downloaded mods or played a lot of Sky Factory, then you’re likely familiar with the ATLauncher for Minecraft. The ATLauncher makes setting aside more RAM even easier than with the default launcher, especially since it means you don’t have to work with any code to make it happen.
Method Three: Allocate RAM Using The Twitch/Curse Launcher
You can also play a variety of Minecraft mods (or normal Minecraft) via the Twitch launcher. Changing the settings is just as easy in this launcher as in the ATLauncher above, but the initial method for reaching those settings is a bit different.
Allocating more RAM to Minecraft can (and in many cases will) make Minecraft perform better, but there are situations in which allocating too much RAM will decrease overall system performance.
Other areas of your PC require RAM, too. While these won’t make a huge impact if they aren’t running at the same time as a game, it’s often a good idea to allow at least 1 GB of RAM for other processes not related to gaming.
If you change your RAM settings and you still do not see the performance you expect—or your PC reports an inaccurate amount of RAM—it can indicate other issues with your memory. It’s a good idea to occasionally check for bad memory.
The good news is that even if you do have an issue with your RAM, swapping it out is simple. In fact, if you want to see even better performance, it’s worth considering purchasing more RAM for your system, especially as memory prices continue to fall.
This article describes some of the commonly used features of Activity Monitor, a kind of task manager that allows you see how apps and other processes are affecting your CPU, memory, energy, disk, and network usage.
Open Activity Monitor from the Utilities folder of your Applications folder, or use Spotlight to find it.
Overview
The processes shown in Activity Monitor can be user apps, system apps used by macOS, or invisible background processes. Use the five category tabs at the top of the Activity Monitor window to see how processes are affecting your Mac in each category.
Add or remove columns in each of these panes by choosing View > Columns from the menu bar. The View menu also allows you to choose which processes are shown in each pane:
CPU
The CPU pane shows how processes are affecting CPU (processor) activity:
Click the top of the “% CPU” column to sort by the percentage of CPU capability used by each process. This information and the information in the Energy pane can help identify processes that are affecting Mac performance, battery runtime, temperature, and fan activity.
More information is available at the bottom of the CPU pane:
You can also see CPU or GPU usage in a separate window or in the Dock:
Memory
The Memory pane shows information about how memory is being used:
More information is available at the bottom of the Memory pane:
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For more information about memory management, refer to the Apple Developer website.
Energy
The Energy pane shows overall energy use and the energy used by each app:
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More information is available at the bottom of the Energy pane:
As energy use increases, the length of time that a Mac can operate on battery power decreases. If the battery life of your portable Mac is shorter than usual, you can use the Avg Energy Impact column to find apps that have been using the most energy recently. Quit those apps if you don't need them, or contact the developer of the app if you notice that the app's energy use remains high even when the app doesn't appear to be doing anything.
Disk
The Disk pane shows the amount of data that each process has read from your disk and written to your disk. It also shows 'reads in' and 'writes out' (IO), which is the number of times that your Mac accesses the disk to read and write data.
The information at the bottom of the Disk pane shows total disk activity across all processes. The graph moves from right to left and updates at the intervals set in View > Update Frequency. The graph also includes a pop-up menu to switch between showing IO or data as a unit of measurement. The color blue shows either the number of reads per second or the amount of data read per second. The color red shows either the number of writes out per second or the amount of data written per second.
To show a graph of disk activity in your Dock, choose View > Dock Icon > Show Disk Activity.
Network
The Network pane shows how much data your Mac is sending or receiving over your network. Use this information to identify which processes are sending or receiving the most data.
The information at the bottom of the Network pane shows total network activity across all apps. The graph moves from right to left and updates at the intervals set in View > Update Frequency. The graph also includes a pop-up menu to switch between showing packets or data as a unit of measurement. The color blue shows either the number of packets received per second or the amount of data received per second. The color red shows either the number of packets sent per second or the amount of data sent per second.
To show a graph of network usage in your Dock, choose View > Dock Icon > Show Network Usage.
Cache
In macOS High Sierra 10.13.4 or later, Activity Monitor shows the Cache pane when Content Caching is enabled in the Sharing pane of System Preferences. The Cache pane shows how much cached content that local networked devices have uploaded, downloaded, or dropped over time.
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Use the Maximum Cache Pressure information to learn whether to adjust Content Caching settings to provide more disk space to the cache. Lower cache pressure is better. Learn more about cache activity.
The graph at the bottom shows total caching activity over time. Choose from the pop-up menu above the graph to change the interval: last hour, 24 hours, 7 days, or 30 days.
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